when science and medicine couldn't bring my mother back to me, these hymns, these songs of faith that she shared with me, were the things that we shared together. ♪ >> reporter: according to armstrong, the choir sings to bring glory to god. and perhaps nowhere is that more evident than in their signature song, beautiful savior, an arrangement done by christiansen. >> that i think has been a song that can epitomize and has been a model for us throughout the years, why do we do this? we sing praise to god. glory and honor, praise, adoration, now and forevermore be thine. that is the focus of our work. >> reporter: when everything falls into place, armstrong says it's a spiritual experience. ♪ >> some people go to prayer and do that, but you know, still small voices and burning bushes don't seem to work with me. you know? but in the minute when that chord locks and we've been struggling with it, and it finally works. it's as if, yeah, god is there. >> reporter: it's an experience he hopes gets transmitted to the audience as well. >> when people, when they leave, they have been transf